QQ Sweeper

One day, Kyutaro Horikita, the tall, dark and handsome cleaning expert of Kurokado High, comes across a sleeping maiden named Fumi Nishioka at school… Unfortunately, their meeting is anything but a fairy-tale encounter! It turns out Kyutaro is a “Sweeper” who cleans away negative energy from people’s hearts—and Fumi is about to become his apprentice!
(Source: Viz Media)